I like a thinner icing so I
can smear it over the top and let the icing drip down the sides of the cake (see picture). If you like a thicker icing, simply add a little more powdered sugar.

* If you don’t have
buttermilk on hand, you can create sour milk by adding 1 tablespoon of lemon
juice (or vinegar) to a 1 a measuring cup and top off with milk to reach the 1
cup needed. Let sit for several minutes to curdle.